7 Taskbar Tweaker
Windows 7 taskbar offers some nice amenities: Jump Lists, program pinning, rich thumbnail previews, and so forth. Of course, it's "your" Windows (at least according to Microsoft's recent TV ads), so you should be able to make the taskbar work exactly the way you want it to.
Enter 7 Taskbar Tweaker, a free program that does what its name suggests. This little utility offers six taskbar adjustments, including one that replaces the Jump List with the old-fashioned window menu when you right-click a running program.
Other options include disabling thumbnail previews, turning off window grouping, opening (rather than pinning) a file that you've dragged to a taskbar program, and cycling through windows when you left-click a grouped button. Our favorite 7 Taskbar Tweaker feature reassigns the middle mouse button to close or focus a window instead of opening a new instance of the program.
Note: This link takes you to the vendor's site, where you can download the version of the software that is appropriate for your system.